A rust bedroom is meant to hold you. I always start with the burnished rust on the wall behind the bed, where it can soak up lamplight and turn the whole corner soft and amber after dark. It is a color with clay in it, more earth than orange, so it feels grounded rather than loud.
To keep that wall from closing in, the other walls wear a quiet warm oat, and the trim and ceiling lift in a creamy soft ivory. That little step up in lightness gives the rust room to breathe and keeps the space from feeling like a cave.
Then I ground it. Walnut brown in the bed frame and a dresser pulls the warmth down to the floor, and a touch of deep clay on a headboard or a single shelf gives the eye its darkest, cosiest place to rest. Layer in linen and a little brass, and the room reads like late afternoon all night long.